Driveline Parking Brake Test Procedure for Medium Duty Vehicles
This SAE Recommended Practice establishes uniform test procedures for friction based parking brake components used
in conjunction with hydraulic service braked vehicles with a gross vehicle weight rating greater than 4500 kg (10 000 lb).
The components covered in this document are the primary actuation and the foundation park brake. Various peripheral
devices such as application dashboard switches or indicators are not included. These test procedures include the
a. Brake Related Tests
1. Brake Functional Performance
2. Brake Dynamic Torque Performance
3. Brake Corrosion Resistance
4. Brake Endurance with Torque
5. Brake Endurance without Torque
6. Vibration Resistance
7. Brake Ultimate Static Load
8. Brake Lining Wear Adjuster Function
b. Actuation Related Tests
1. Mechanical Actuator Functional Performance
2. Mechanical Actuator Endurance
3. Mechanical Actuator Quick Release
4. Mechanical Actuator Ultimate Load
5. Spring Apply Actuator Functional Performance
6. Spring Apply Actuator Operating Temperature Range
7. Spring Apply Actuator Endurance
8. Spring Apply Actuator Corrosion Resistance
9. Spring Apply Actuator On-Off Switch
10. Spring Apply Actuator Vibration
Rationale: SAE J2690 specifies uniform accelerated laboratory test procedures for evaluating comparative performance characteristics of friction type parking brake components designed to operate in conjunction with hydraulic brake systems. These tests are based upon long standing industry practices.
Vibration data shown in Table 3 was derived at axle location. A decision to use this data for axle or transmission mounted parking brakes was made under the assumption that in most cases, using axle data for transmission mounted parking brakes would be conservative.
Also known as: SAE J 2690
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